{
  "schema": 1,
  "date": "2026-10-21",
  "request": "最大瘦脸差异与人物转脸时的变形机制",
  "reference": {
    "plugin_sha256": "6c5d74bc844a5c5f745718b48ea10ec6635d08aa08a5b6dc6e62653980849f8a",
    "arm64_sha256": "f01e8c0b7e2676b2961950b0e48efdd2589af218e4b36de7d39f5d1c76852bfb",
    "metallib_sha256": "4e8c77db8be94ae169337a2e646407f69520b63afb248faa653e0e068237aaae"
  },
  "air_observation": {
    "authority": "static Apple metal-objdump AIR disassembly; not observed shader execution",
    "command": "xcrun metal-objdump --metallib --disassemble-symbols=faceThinFragmentShader <reference default.metallib>",
    "full_output_sha256": "f97705b88f5491057df2117aef457ffca84e11020574cd57742b0670db4484d8",
    "full_output_bytes": 274496,
    "local_output": "build/pose-analysis/face-thin.air.txt",
    "module": "faceThinFragmentShader",
    "module_metallib_offset": "0x5d5e",
    "function": "mssFaceShapePinCoordinate",
    "active_branch": "faceShapeParamsActive selects Shape helper; inactive branch alone selects legacy Thin helper",
    "local_pin_triplets": [
      [
        75,
        74,
        6
      ],
      [
        59,
        60,
        13
      ],
      [
        74,
        73,
        47
      ],
      [
        60,
        61,
        47
      ],
      [
        73,
        72,
        47
      ],
      [
        61,
        62,
        47
      ],
      [
        72,
        71,
        48
      ],
      [
        62,
        63,
        48
      ],
      [
        71,
        70,
        48
      ],
      [
        63,
        64,
        48
      ],
      [
        70,
        69,
        49
      ],
      [
        64,
        65,
        49
      ],
      [
        69,
        68,
        49
      ],
      [
        65,
        66,
        49
      ],
      [
        68,
        67,
        52
      ],
      [
        66,
        67,
        52
      ],
      [
        67,
        65,
        47
      ]
    ],
    "triplet_usage": "first=origin, third=anchor; second unused in thin loop",
    "thin_cpu_scale": 0.025,
    "size_gain": "clamp(280/max(length((P75-P59)*imageSize),2*length((P67-(P74+P60)/2)*imageSize),1),1,2.25)",
    "effective_pin_gain": "clamp(UI thin,0,1) * strengthMultiplier * 0.025 * size_gain",
    "radius": "length(origin-anchor) in normalized image UV",
    "falloff": "clamp(1-length(currentSampleCoordinate-origin)/radius,0,1)",
    "inverse_sample_step": "q = clamp(q-(anchor-origin)*effective_pin_gain*falloff,0,1)",
    "iteration": "17 sequential updates; not 17 independent offsets evaluated at one original coordinate",
    "bounded_negative_findings": [
      "No yaw/roll/pitch input to the checked GPU helpers",
      "No explicit side-view angle gate in the checked thin branch",
      "No explicit eye/nose restore mask in the checked thin branch; each single pin has zero weight at its own anchor"
    ],
    "limits": [
      "This is a 2D local landmark deformation, not proof of 3D head pose estimation",
      "Static paths are not a capture of the exact runtime branch used in the supplied screenshots",
      "Other contour controls include fixed horizontal offsets; not all controls share rotation-equivariant behavior"
    ]
  },
  "vision_probe": {
    "authority": "Independent public Apple Vision / AVFoundation invocation; no reference app or plug-in executed",
    "script": "scripts/inspect-face-geometry.m",
    "revision": 3,
    "constellation": 76,
    "maximum_dimension": 1280,
    "coordinate_system": "full-image normalized, y up",
    "region_indices": {
      "contour": [
        59,
        60,
        61,
        62,
        63,
        64,
        65,
        66,
        67,
        68,
        69,
        70,
        71,
        72,
        73,
        74,
        75
      ],
      "innerLips": [
        42,
        40,
        43,
        45,
        41,
        44
      ],
      "leftEye": [
        0,
        4,
        5,
        1,
        3,
        2
      ],
      "leftPupil": [
        6
      ],
      "nose": [
        47,
        56,
        54,
        53,
        52,
        51,
        50,
        55
      ],
      "noseCrest": [
        46,
        47,
        48,
        49,
        58,
        57
      ],
      "outerLips": [
        27,
        28,
        29,
        30,
        31,
        32,
        33,
        34,
        35,
        36,
        37,
        38,
        39,
        26
      ],
      "rightEye": [
        7,
        11,
        12,
        8,
        10,
        9
      ],
      "rightPupil": [
        13
      ]
    },
    "frames": [
      {
        "time": 0,
        "face_count": 1,
        "all_point_counts": [
          76
        ],
        "yaw_radians": [
          0
        ],
        "pitch_radians": [
          null
        ]
      },
      {
        "time": 2,
        "face_count": 1,
        "all_point_counts": [
          76
        ],
        "yaw_radians": [
          0.7853981852531433
        ],
        "pitch_radians": [
          null
        ]
      },
      {
        "time": 4,
        "face_count": 1,
        "all_point_counts": [
          76
        ],
        "yaw_radians": [
          1.5707963705062866
        ],
        "pitch_radians": [
          null
        ]
      },
      {
        "time": 6,
        "face_count": 1,
        "all_point_counts": [
          76
        ],
        "yaw_radians": [
          0
        ],
        "pitch_radians": [
          null
        ]
      },
      {
        "time": 8,
        "face_count": 1,
        "all_point_counts": [
          76
        ],
        "yaw_radians": [
          0
        ],
        "pitch_radians": [
          null
        ]
      },
      {
        "time": 10,
        "face_count": 1,
        "all_point_counts": [
          76
        ],
        "yaw_radians": [
          0
        ],
        "pitch_radians": [
          null
        ]
      },
      {
        "time": 12,
        "face_count": 1,
        "all_point_counts": [
          76
        ],
        "yaw_radians": [
          0
        ],
        "pitch_radians": [
          null
        ]
      },
      {
        "time": 14,
        "face_count": 1,
        "all_point_counts": [
          76
        ],
        "yaw_radians": [
          0
        ],
        "pitch_radians": [
          null
        ]
      },
      {
        "time": 16,
        "face_count": 1,
        "all_point_counts": [
          76
        ],
        "yaw_radians": [
          0
        ],
        "pitch_radians": [
          null
        ]
      },
      {
        "time": 18,
        "face_count": 1,
        "all_point_counts": [
          76
        ],
        "yaw_radians": [
          1.5707963705062866
        ],
        "pitch_radians": [
          null
        ]
      },
      {
        "time": 20,
        "face_count": 1,
        "all_point_counts": [
          76
        ],
        "yaw_radians": [
          0.7853981852531433
        ],
        "pitch_radians": [
          null
        ]
      }
    ],
    "result": "All 11 sampled frames returned one face and 76 points; 4s/18s reported yaw approx pi/2; pitch unavailable",
    "privacy": "Source frames, complete landmarks and source path remain ignored under build/pose-analysis/vision and are not included in Git"
  },
  "reconstruction_baseline": {
    "commit": "e03e460a9b3e5ad489aad24095485ba10ceb987d",
    "installed_version": "1.0.4 (6)",
    "root_causes": [
      "thin deformation uses bounding box x/y/size rather than saved contour/nose points",
      "horizontal symmetric inverse warp is applied at full strength for any valid box",
      "no contour/landmark completeness guard or pose metadata preservation",
      "fixed coefficients do not match reference local-pin scaling"
    ],
    "direction_check": "Positive thin samples outward and moves image features inward; the sign is not reversed",
    "test_gap": "Existing geometry tests establish pixel changes, extent and persistence, not reference likeness or profile shape preservation"
  },
  "checklist": {
    "why_maximum_slim_differs": "answered: different geometric model, locality and effective strength",
    "how_profile_is_handled": "answered within checked active thin path: projected 2D landmarks, local directions/radii; no established explicit yaw gate",
    "full_native_visual_equivalence": "unverified; screenshots are not a synchronized isolated-parameter capture",
    "product_fix": "not changed by this analysis; installed 1.0.4 retains the reported issue"
  },
  "host_boundary": "User controls Motion/FCP; no UI interaction, host shutdown, app install or plug-in replacement in this analysis."
}